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Zirconia special foam ceramic filter and preparation method thereof

A technology of foam ceramics and zirconia, which is applied in the purification of metal solutions of high-grade special alloy steels, and in the field of zirconia special foam ceramic filters, can solve the problems of poor thermal shock resistance and reduced impact resistance, and improve heat resistance Shock performance, reduce brittleness, improve the effect of fracture strength

Active Publication Date: 2013-08-21
宜兴市华瑞铸造材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The zirconia foam ceramic filter made of it is weakly acidic or inert, resistant to corrosion and high temperature, but its Achilles heel is its poor thermal shock resistance. It still cannot avoid cracking and fragmentation under rapid cooling and rapid heating, which greatly reduces the its impact resistance
[0005] As we all know, ceramic refractory materials are characterized by high temperature resistance, corrosion resistance and high strength, but their Achilles heel is brittleness, and zirconia foam ceramic materials also uphold these characteristics

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1) Mix 38% zirconia, 32% nano-zirconia, 10% nano-metal zirconium, 0.5% yttrium oxide, 1.5% calcium oxide, 1.5% magnesium oxide, and 0.1% aluminum oxide by ball milling.

[0024] 2) Stir and mix the ceramic powder prepared in step 1) with carboxymethyl cellulose, polyvinyl alcohol, and water according to the weight ratio of 84:0.5:0.5:11, add to the mixer and stir evenly for 3-4 hours to make a ceramic slurry. Foam ceramics are made into semi-finished products by conventional production methods and sizing and drying processes;

[0025] 3) Put the dried and hardened semi-finished billet into a high-temperature nitriding furnace for nitriding and firing according to the following procedures:

[0026] 3.1) At room temperature - 500°C at a temperature measurement speed of 80°C / h, so that the foam is completely carbonized and volatilized;

[0027] 3.2) 500-600°C, the pressure in the furnace is 1.5-2kg / ㎝2, the temperature is raised rapidly for 30 minutes, and at the same time...

Embodiment 2

[0032] 1) Mix 42% zirconia, 30% nano-zirconia, 8% nano-metal zirconium, 1.5% yttrium oxide, 0.5% calcium oxide, 0.5% magnesium oxide, and 0.5% aluminum oxide by ball milling.

[0033] 2) Stir and mix the ceramic powder prepared in step 1) with carboxymethyl cellulose, polyvinyl alcohol, and water according to the weight ratio of 84:0.5:0.5:11, add to the mixer and stir evenly for 3-4 hours to make a ceramic slurry. Foam ceramics are made into semi-finished products by conventional production methods and sizing and drying processes;

[0034] 3) Put the dried and hardened semi-finished billet into a high-temperature nitriding furnace for nitriding and firing according to the following procedures:

[0035] 3.1) At room temperature - 500°C at a temperature measurement speed of 80°C / h, so that the foam is completely carbonized and volatilized;

[0036] 3.2) 500-600°C, the pressure in the furnace is 1.5-2kg / ㎝2, the temperature is raised rapidly for 30 minutes, and at the same time,...

Embodiment 3

[0041]1) Mix 40% zirconia, 28% nano-zirconia, 12% nano-metal zirconium, 1% yttrium oxide, 1% calcium oxide, 1% magnesium oxide, and 0.3% aluminum oxide by ball milling.

[0042] 2) Stir and mix the ceramic powder prepared in step 1) with carboxymethyl cellulose, polyvinyl alcohol, and water according to the weight ratio of 84:0.5:0.5:11, add it into the mixer and stir evenly for 3-4 hours to make a ceramic slurry. Foam ceramics are made into semi-finished products by conventional production methods and sizing and drying processes;

[0043] 3) Put the dried and hardened semi-finished billet into a high-temperature nitriding furnace for nitriding and firing according to the following procedures:

[0044] 3.1) At room temperature - 500°C at a temperature measurement speed of 80°C / h, so that the foam is completely carbonized and volatilized;

[0045] 3.2) 500-600°C, the pressure in the furnace is 1.5-2kg / ㎝2, the temperature is raised rapidly for 30 minutes, and at the same time, ...

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Abstract

The invention discloses a zirconia special foam ceramic filter with good high-temperature strength and good thermal shock resistance and a preparation method thereof. The filter comprises the following materials in percentage by weight: 38-42 percent of zirconia, 28-32 percent of nanometer zirconia, 8-12 percent of nanometer zirconium metal, 0.5-1.5 percent of yttrium oxide, 0.5-1.5 percent of calcium oxide, 0.5-1.5 percent of magnesium oxide, 0.1-0.5 percent of aluminum oxide, 0.2-0.8 percent of carboxymethyl cellulose, 0.5-1.5 percent of polyvinyl alcohol and 8-11 percent of water. The preparation method comprises the following preparation processes: ball-milling and mixing the zirconia, the nanometer zirconia, the nanometer zirconium metal, the yttrium oxide, the calcium oxide, the magnesium oxide and the aluminum oxide, uniformly agitating with the carboxymethyl cellulose, the polyvinyl alcohol and the water, sizing and drying to prepare a semi-finished product and finally adding into a high-temperature nitriding furnace for nitriding and firing.

Description

technical field [0001] The invention relates to a foam ceramic filter, in particular to a special zirconia foam ceramic filter, which is mainly used in the smelting and casting industry, and is especially suitable for the purification treatment of metal solution of high-grade special alloy steel. Background technique [0002] With the vigorous development of smelting and casting industries at home and abroad, in smelting and casting production technology, in order to purify the metal solution and improve the precision of casting quality, the use of metal melt filtration technology has been promoted in the smelting and casting industry at home and abroad, and the metal melt The core component of the filtration process is the filter. In recent years, the ceramic foam filter has become the mainstream of the metal melt filter and is widely used in the smelting and casting industry. [0003] At present, many domestic manufacturers of foam ceramic filters have developed a variety ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/06C04B35/48C04B35/622B01D39/20
Inventor 陈俊泽陈江东
Owner 宜兴市华瑞铸造材料有限公司